Clamp



F. HUBER.

GLAMP (No Model.)

Pateted Dec. 24, 1889;

Illlnr UNITED STATES PATENT OEEICE.

FREDERICK HUBER, OF DOIVNINGTOXVN, PENNSYLVANIA. Y

CLAM P.

SPECIFICATION forming part of Iletters Patent No. 417,919, datedDecember 24, 1889.

Application tiled August 10, 1889. Serial No. 320,376. (No model.)

To all whom may concern:

Be it known that I, FREDERICK HUBER, a citizen of the United States, anda resident of Downingtown, Chester county, Pennsylvania, have inventedcertain Improvements in Clamps, of which the following is aspecification.

My invention consists of certain improvements in that class of clampsused by carpenters, machinists, and others, and consisting of a pair ofcla1npingbars caused to move from and toward each other by means of ascrew carried by one of the bars and `adapted to a nut formed upon theYother bar,

the objects of my invention being to provide for the rigid and accurateguidance of the movable bar in a clamp of this character, and to readilyadapt the clamp for holding beveled surfaces-as, for instance, the barsof a frame where they are joined at the corner. These objects I attainin the manner hereinafter set forth, reference being had to theaccompanying drawings, in which- Figure l is a perspective View of aclamp constructed in accordance` with my invention. Fig. 2 is a sideview oi the same, partly in section; and Fig. 3 is a detached view ofone of the clamping blocks or jaws.

VA and B represent the two bars of the clamp, and D the operating-screw,which in the present instance has an enlarged head a, adapted to acountersunk boss or projection centrally located on the bar A, theenlarged head of the screw being coniined to said boss by means of aplate c, bolted to the under side of the bar, as shown in Fig. 2. Thescrew-bolt D is thus confined longitudinally to the bar A, but is freeto turn therein. The bar B has a central nut d, for the reception of thescrew-bolt, and both bars are provided with bosses j', for the receptionof guideiods F, which are secured. Within the bosses of the bar A, butpass freely through the bosses of the bar B, so that said bar can bemoved to and fro on the rods, but

will be guided and steadied by said rods in this movement. The upperends of the rods carry a plate G, through which passes the upper end ofthe screw-bolt D, that portion of the bolt above the plate being squaredor otherwise shaped for the reception of the hub of an operating wheelor disk J, which has a projecting handle K, and is confined to the endof the screw-bolt D by a nut g. In the under side of the wheel or disk Jis formed an annular groove t, for the reception ofthe upper ends t" ofthe guiderods F, which project above the plate G, and thus serve toguide and steady the wheel or disk in its rotative movement; hence, whenthe screw-bolt is turned by means of the wheel or disk J, the bar B ofthe clamp is caused to move from or toward the bar A, so as to grip orrelease the work inserted between the two bars.

In order to provide for holding work the sides of which are at an anglein respect to each other-as,rfor instance, the bars at the corner of aframe-I provide the clampingbars A and B at the ends with blocks adaptedto confine such inclined surface, these blocks being either V-shaped, asshown at M in Fig. l, or being simply beveled blocks, as shown at N. Inthe latter case, however, the inclined faces of the blocks should beprovided with retaining spurs or barbs m, to prevent the Work fromslipping from between them when pressure is applied thereto. The blocksM and N are secured to the blocks A B by means of set-screws u, so thatthey can bem readily removed when their use is not required.

Having thus described myinvention, I claim and desire to secure byLetters Patent-.-`

l. The combination of the two clamp-bars, the operating-.screw swiveledto one of said bars and adapted to a nut on the other bar, theguide-rods secured to one bar and passing through openings in the otherbar, and an..

operating Wheel or disk secured to the projecting end of the screw-bolt,substantially as specied.

2. The combination of the two cla1np-bars, the screw-bolt swiveled inone ot said bars and adapted to a nut on the other bar, the guiderodssecured to one bar and passing through openings in the other bar, and awheel or disk secured to the proj ecting` end of the screw-bolt andhaving an annular groove for the reception of the ends of theguide-rods, substantially as specified.

3. The combination of the bars of the clamp, the operating-screw, andthe guiderods therefor, with beveled blocks secured to IOO theadjoinugrfaces of the clamp-bars at the In testimonyWhereoflhavesignedmynme ends of the sam e, substan tially as speoied. to thisspecification 111 the presence of two sub- 4. The combination of theclamp-bars, the scribing Witnesses.

Operating-screw and guide-rods, and the bev- FR. HUBER. 5 @led blockssecured to the ends of the clamp- Titnessesz bars and having projectingspurs 0r barbs on PETER SHERIDAN,

theirinclined faces, substantially as specied. L. T. BREMERMAN.

